package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.util.StringUtil;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WorkspaceService workspaceService;

    /**
     * 营业额统计
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        //用List存储begin到end之间的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);
        while (!begin.equals(end)) {
            //日期计算
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //用List存储每日的营业额
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList){
            //查询date日期的营业额
            LocalDateTime beignTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            //封装到turnoverList
            HashMap map = new HashMap();
            map.put("begin", beignTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);

            Double turnover =  orderMapper.sumByMap(map);
            turnoverList.add(turnover == null ? 0.0 : turnover);
        }

        //封装返回值
        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
    }


    /**
     * 用户统计
     * @param begin
     * @param end
     * @return
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //用List存储begin到end之间的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);
        while (!begin.equals(end)) {
            //日期计算
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //用List存储每日的新增用户数
        List<Integer> newUserList = new ArrayList<>();


        //用List存储总用户数w
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : dateList){
            //查询date日期的营业额
            LocalDateTime beignTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            //封装到turnoverList
            HashMap map = new HashMap();
            map.put("end", endTime);
            //查询总用户数
            Integer totalUser =  userMapper.countByMap(map);
            totalUserList.add(totalUser);
            //查询新增用户数
            map.put("begin", beignTime);
            Integer newUser =  userMapper.countByMap(map);
            newUserList.add(newUser);
        }


        return UserReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .build();
    }

    /**
     * 订单统计
     * @param begin
     * @param end
     * @return
     */
    @Override
    public OrderReportVO getOrdersStatistics(LocalDate begin, LocalDate end) {
        //用List存储begin到end之间的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);
        while (!begin.equals(end)) {
            //日期计算
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //用List存储每日的订单总数
        List<Integer> orderCountList = new ArrayList<>();
        //用List存储每日的有效订单数
        List<Integer> validOrderCountList = new ArrayList<>();


        //遍历dateList集合，获取每日的订单总数和有效订单数据
        for (LocalDate date : dateList){
            //查询date日期的订单数据
            LocalDateTime beignTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            //查询每日的订单总数
            Integer orderCount = getOrderCount(beignTime, endTime, null);
            orderCountList.add(orderCount);

            //查询每日的有效订单总数
            Integer validOrderCount = getOrderCount(beignTime, endTime, Orders.COMPLETED);
            validOrderCountList.add(validOrderCount);
        }

        //计算总订单数
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();

        //计算总有效订单数
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        //计算订单完成率
        Double orderCompletionRate = 0.0;
        if (totalOrderCount != 0) {
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }

        return OrderReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 销量排名
     * @param begin
     * @param end
     * @return
     */
    @Override
    public SalesTop10ReportVO getTop10(LocalDate begin, LocalDate end) {

        LocalDateTime beignTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beignTime, endTime);
        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");

        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");


        return SalesTop10ReportVO
                .builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    /**
     * 导出Excel
     * @param response
     */
    @Override
    public void exportBusinessData(HttpServletResponse response) {
        //查询数据库，获取最近30天营业数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);

        LocalDateTime beignTime = LocalDateTime.of(dateBegin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(dateEnd, LocalTime.MAX);

        BusinessDataVO businessDataVO = workspaceService.getBusinessData(beignTime, endTime);

        InputStream in = this.getClass().getClassLoader().getResourceAsStream("temaplate/运营数据报表模板.xlsx");
        try {
            //基于模板文件创建Excel对象
            XSSFWorkbook excel = new XSSFWorkbook(in);
            //获取第一个sheet
            XSSFSheet sheet = excel.getSheet("Sheet1");
            sheet.getRow(1).getCell(1).setCellValue("时间："+dateBegin + "至" + dateEnd);
            //获得第4行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());
            //获得第5行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            //填充明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = dateBegin.plusDays(i);
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(5).setCellValue(businessData.getNewUsers());
            }

            //通过POI将数据写入 Excel
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);
        } catch (IOException e) {
            e.printStackTrace();
        }


        //输出输出Excel文件下载到客户端

    }



    /**
     * 查询指定时间区间内的订单数量
     * @param begin
     * @param end
     * @param status
     * @return
     */
    private Integer getOrderCount(LocalDateTime begin, LocalDateTime end, Integer status) {
        HashMap map = new HashMap();
        map.put("begin", begin);
        map.put("end", end);
        map.put("status", status);
        return orderMapper.countByMap(map);
    }

}
